Producing dipped goods from organic dispersions



Patented Oct. 6, 1931 UNITED STATES PATENT OFFICE PAUL KLEIN AND IRAN GABOR, F BUDAPEST, HUNGARY, ASSIGNORS, BY MESNE ASSIGNMENTS, TO AMERICAN ANODE INO., AOORPORATION OF DELAWARE PRODUCING IDIIPI'EID GOODS FROM ORGANIC 'DISPERSIONS H No Drawing. Application filed January 21, 1928, Serial No. 248,556, and in Hungary and Germany February 23, 1927. e

The invention relates to the production of goods by means of repeated dippingoperations from aqueous or other dispersions of organic substances primarily from natural 51 and if desired concentrated rubber dispelsions to which additional substances may have been added, or from artificial rubber dispersions or moreover from artificial or natural dispersions of other vegetable resinssuch as for example guttapercha, balata, either in an unvulcanized or vulcanized state, or moreover from dispersions of reclaimed or vulcanized rubber as well as from other dispersions of organic substances such 1 as dispersions of casein, cellulose esters and artificial resins.

The repeated dipping. operations may be carried out either with the aid of impermeable moulds upon which the dispersions agglomerate owing to adhesion orby the employment of means known per se, adapted to promote coagulation or agglomeration. Thus for example moulds can be employed, the material of which partly goes into solution and supplies the ions eifecting the coagulation, for examplegypsum moulds when working with aqueous rubber dis ersions. Moreover absorbent or porous mou ds such as for example moulds'of unglazed clay may be employed and the agglomeration may be promoted by aspiration at the side opposite the dispersion, or by imbibing the clay moulds with substances adapted to effect coagulation and to give up these substances to the dispersion to be treated. The suction can be, if desired maintained during the dryjunction and may also be combined with other suitable methods.

The essence of the-invention lies in the fact that the dippingmoulds during the interval of the drying or solidifying effected between the individual dippings and if de sired also during the dipping into the dispersion are heated above the temperature of their surroundings. The heating may be effected in any suitable way for instance by passing a gaseous or liquid heating agent through the moulds or by electrical inductive or resistance heating. If the dipping moulds are porous, the'heating may also be elfected by means of a solution passing through the interior ofthe moulds which difl'uses through the pores of the mould and promotes the agglomeration of the dispersion-on the surface of the mould.

In cases where the deposition base serves 'for the production of rotary hollow bodies or endless goods such as tubes, bands, impregnated or coated substances or coated metallic conductors and moves continuously through the dispersion for example as an endless deposition band or a revolving for example cylindrical precipitation mould, core or drum or as the endless metal object to be coated, the deposition base may also be heated in such a. manner that not only the portions dipping into the liquid but alsothose portions outside the liquid are heated, so that in the production of endless closed goods the deposit is formed and dried in a continuous manner;

In order to increase the effect it is generally advantageous to select the heating temperatures as high as possible but care must be taken to avoid gas and vapour bubbles being produced upon the deposition surface owing to the increase in temperature. The temperature towhich the moulds are heated may be uniform during the heatingperlod or may vary. Thus for example durmg the dipping periods the heating may be moderate, whereas it may be increased during the settling and drying periods between the individual dippings. The extent of the heating may also differ during the indlvidual periods of the process.

It is advant cons to keep the dipping mould removed rom the li uid in a moist atmosphere durin the heating.

Finally the mo d may also be constructed 5 in such a manner that individual parts thereof can be heated to different degrees.

Thus for exam 1e when emplo g'a rotatable drum as eposition base t e portion dip ing into the liquid and the portion protru in from the llquid for the time being can be eated to different degrees.

The inventionconsiderably accelerates the workin process by shortening the time necessary or drying. I

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim 1s:-

1. A process for the production of goods from aqueous or other dispersions of organic substances particularly from natural or artificial rubber dispersions by repeated dipping in which the di ping mould is heated durlng the intervals etween the individual dippings and if desired also during the dipping into the dispersion.

2. Process as set forth in claim 1, in which the heating is effected b a heating agent passed through the nioul s.

3. Process as set forth in claim 1, in which the heating is effected by electric current.

4. Process as set forth in claim 1, in which porous moulds are employed for the diping and in which the heating is eifected y means of a solution passed through the interior chamber, the diffusion of which through the mould promotes the ag lomeration of the dispersion or the solidi g of 40 the precipitate.

5. Process as set forth in claim 1, in which the degree of the heating during the dipping of the mould into dispersion difiers mm the degree of heating during the riod when the mould is outside the liqui 6. Process as set forth in claim 1, in which individual portions of the deposition base :re heated to difierent degrees of temperaure.

7. Process as set forth in claim 1, in which the drying betweenthe individual dip ing operations is effected in a moist atmosp ere.

In testimony whereof we afiix our signatures.

Da. PAUL KLEIN. FRANCIS GABOR. 

